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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.tls;

import java.io.EOFException;

/**
 * This exception will be thrown (only) when the connection is closed by the peer without sending a
 * {@link AlertDescription#close_notify close_notify} warning alert. If this happens, the TLS
 * protocol cannot rule out truncation of the connection data (potentially malicious). It may be
 * possible to check for truncation via some property of a higher level protocol built upon TLS,
 * e.g. the Content-Length header for HTTPS.
 */
public class TlsNoCloseNotifyException
    extends EOFException
{
    public TlsNoCloseNotifyException()
    {
        super("No close_notify alert received before connection closed");
    }
}